QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

Earthquake near Chino Hills, CA

No earthquake was likely felt in Chino Hills in the 24 hours to 3:45 pm PST (23:45 UTC). The last one was M 3.2, 16 km (10 mi) E, at 5:37 am PDT on 2 September 2026, estimated intensity III (weak) in town; 730 felt reports to USGS. Every earthquake near Chino Hills

This page: a magnitude 2.7 earthquake was recorded 6 km (4 mi) southeast of Chino Hills, CA, at 4:42 am PDT on 10 June 2023 (11:42 UTC), 13 km deep. 2 people have reported feeling it to USGS.

USGS: 6km SE of Chino Hills, CA

in Chino Hills, CA · 64 km (40 mi) E of Los Angeles, CA

4:42 am PDT, Jun 10, 2023 · · 13 km deep · released about 340 lb of TNT

Every earthquake near Chino Hills Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 32 kmLos Angeles County 57 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
4:42 am PDT on 10 June 2023 ()
Where
6 km (4 mi) southeast of Chino Hills, CA · earthquakes near Chino Hills
Magnitude
M 2.7 (ml)
Depth
13 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Orange County, 32 km S
Nearest mapped fault
Elsinore fault, 8 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1188 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 21 km (13 mi) from the epicentre. In Chino Hills, 6 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Likely felt in: Chino Hills 6 km, intensity II · Chino 7 km, intensity II · Pomona 12 km, intensity II · Yorba Linda 12 km, intensity II · Diamond Bar 12 km, intensity II · Ontario 13 km, intensity II · Montclair 14 km, intensity II · Eastvale 14 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 lb of TNT

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

For this area

The largest earthquake within 50 km since 2016 was M 4.5 on 2020-09-19 — about 580 times the energy of this one.

Before 2016, the USGS record lists 16 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.4 The 1933 Long Beach, California Earthquake · 45 km SW of this epicentre
  2. 6.2 3 km SE of San Bernardino, California · 45 km ENE of this epicentre
  3. 6.0 The 1910 Lake Elsinore, California Earthquake · 41 km SE of this epicentre
  4. 5.9 The 1987 Whittier Narrows, California Earthquake · 35 km WNW of this epicentre
  5. 5.8 The 1991 Sierra Madre, California Earthquake · 43 km NW of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 33.9555, -117.7157. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Orange County, CA 32 km (20 mi) S earthquakes near Orange County
Los Angeles County, CA 57 km (35 mi) WNW earthquakes near Los Angeles County
San Diego County, CA 135 km (84 mi) SE earthquakes near San Diego County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

56 earthquakes have been recorded within 50 km since this one.

  1. 1.6 4 km ESE of Home Gardens, CA
  2. 1.9 7 km N of Rancho Cucamonga, CA
  3. 1.6 5 km S of Redlands, CA
  4. 1.6 2 km N of Loma Linda, CA
  5. 1.6 6 km NE of Muscoy, CA
  6. 1.5 3 km WSW of Huntington Beach, CA
  7. 1.7 5 km SSE of Home Gardens, CA
  8. 1.6 2 km NNW of Fontana, CA
  9. 1.6 5 km SSE of Home Gardens, CA
  10. 2.4 1 km E of Loma Linda, CA
  11. 2.5 6 km NNE of Fontana, CA
  12. 2.2 6 km NNE of Fontana, CA
  13. 1.9 6 km NNE of Fontana, CA
  14. 2.1 6 km NNE of Fontana, CA
  15. 1.5 2 km ESE of Home Gardens, CA

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.